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• problem with Double and Rational Number

  - by altair211

  Hi, I am writing a function in which I need to read a string contains floating point number and turn it back to Rational. But When I do toRational (read input :: Double), it will not turn for eg: 0.9 into 9 % 10 as expected, but instead 81..... % 9007... Thx

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• How to apply two functions on the same string without using ">>"

  - by altair211

  Hi, I am writing a function like this. func :: IO() func = putStr print "func = putStr print" I know it is incorrect but the idea is I want the putStr applied to the string then print applied to the same string "fun = .." so that the output would be: func = putStr print "func = putStr print" which is the same as my function definition. Thanks

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• patter matching for custom read function

  - by altair211

  Hi, I am writing a custom read function for one of the data types in my module. For eg, when I do read "(1 + 1)" :: Data, I want it to return Plus 1 1. My data declaration is data Data = Plus Int Int. Thanks

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• How to apply two functions onto the same string without using ">>"

  - by altair211

  Hi, I am writing a function like this. func :: IO() func = putStr print "func = putStr print" I know it is incorrect but the idea is I want the putStr applied onto the string then print applied onto the same string "fun = .." so that the output would be: func = putStr print "func = putStr print" which is the same as my function definition. Thanks

  Read the article

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